TED-AJ03-520 THE NUMERICAL SIMULATION ON UNSTABLE BEHAVIORS OF PREMIXED FLAMES GENERATED BY HYDRODYNAMIC AND DIFFUSIVE-THERMAL EFFECTS
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概要
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Unstable behaviors of premixed flames generated by hydrodynamic and diffusive-thermal effects are studied by two-dimensional unsteady calculations of reactive flows. In the present numerical simulation, the compressible Navier-Stokes equation including a one-step irreversible chemical reaction is employed. We consider two basic types of phenomena to account for the intrinsic instability of premixed flames, i. e., hydrodynamic and diffusive-thermal effects. The hydrodynamic effects is caused by the thermal expansion through flame fronts; the diffusive-thermal effect is caused by the preferential diffusion of mass and heat. A disturbance with the characteristic wavelength λ, which corresponds to the maximum growth rate, is superimposed on a stationary planar flame, and the formation of cellular flames generated by hydrodynamic and diffusive-thermal effects is numerically simulated. When the Lewis number Le is 0.5 (<1), i. e., when the diffusive-thermal effect has a destabilizing influence, unstable behaviors of cellular flames appear. The division and combine of cells of premixed flames are also observed (see Fig. 1). On the other hand, when Le is 1.0,i. e., when the diffusive-thermal effect has no influence, unstable behaviors disappear and cellular flames are stable (see Fig. 2). The results suggest that the diffusive-thermal effect has an important role in the appearance of unstable behaviors of cellular flames.[figure]
- 一般社団法人日本機械学会の論文
著者
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KOBAYASHI Hideaki
Institute of Fluid Science, Tohoku University
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Kadowaki Satoshi
Department Of Mechanical Engineering Nagaoka University Of Technology
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Mashiko Takayuki
Department of Mechanical Engineering, Nagaoka University of Technology
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Mashiko Takayuki
Department Of Mechanical Engineering Nagaoka University Of Technology
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Kobayashi Hideaki
Institute Of Fluid Science Tohoku University
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